<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        *{
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
        }
        .box{
            height: 400px;
            background-color: lightgray;
        }
        ul{
            display: flex;
            flex-direction: row;
            flex-wrap: wrap;
            justify-content: space-between;
            align-content: space-between;
            padding: 90px 40px 90px 60px;
           
        }
        ul>li{
            align-self:center;
            margin:20px;
            width: 500px;
            height: 100px;
            background-color: lightblue;
        }

        li{
            display: flex;
            flex-direction: row;
            align-content: space-between;
            align-items: center;
        }
        li>div{
            margin-left: 10px;
        }


    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li>
                <div  style="background-color: yellow; width:60px;height:60px" >
                </div>
                <div>
                    <h2>这是标题1</h2>
                    <span>这是内容介绍1</span>
                </div>
            </li>
            <li>
                <div  style="background-color: red; width:60px;height:60px" >
                </div>
                <div>
                    <h2>这是标题2</h2>
                    <span>这是内容介绍2</span>
                </div>
            </li>
            <li>
                <div  style="background-color: green; width:60px;height:60px" >
                </div>
                <div>
                    <h2>这是标题3</h2>
                    <span>这是内容介绍3</span>
                </div>
            </li>
            <li>
                <div  style="background-color: blue; width:60px;height:60px" >
                </div>
                <div>
                    <h2>这是标题4</h2>
                    <span>这是内容介绍4</span>
                </div>
            </li>
        </ul>
    </div>
</body>
</html>